[D13]

The 194 head has smaller chambers, which raises compression, but has siamesed exhaust ports, degrading ability to use headers. Also the smaller chamber and small bore will shroud valves larger than stock, limiting the upper RPM breathing if used on a 250.

The crank will drop in but the compression height on the pistons is different, so custom pistons or rods will be needed. Custom rods with 50 year old piston technology... better off doing the pistons.

Unless your racing class has a CID limit, for the same cost, you can build a 250, use 305 1.8" intake valves, 1.6" valves on the exhaust, and make more power. Or leave it stock and use the longer stroke and 50 extra CID to make more torque.

Kind of why GM only put the 194 in the Nova - wouldn't pull a truck or Impala. Increased bore to make the 230 then stroked to make the 250, which is a pretty decent engine.